Question about 2002 Ford Excursion

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2002 Ford Excursion battery light come on intermittently

Why does 2002 Ford Excursion battery light come on intermittently? It has two new batteries, alternator tested OK. Is it an electrical short, how do I trace the short?

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  • Charles  Baker
    Charles Baker Jan 23, 2009

    Previous owner instaled a DVD player, two LCD screens, and a wireless headset transmitter. The alternator was checked at Checkers Auto Parts Store.

  • Keith Methot
    Keith Methot May 11, 2010

    Has the vehicle ever had, or does it have anything aftermarket in it.. like an alarm system, or remote start, stereo, and whom or where check the alternator?? please be specific in your answer..

  • Anonymous Mar 23, 2014

    I have ford fusion3 year 2002 and I have replaced the alternator but the battery light is still on any ideas on switching it off ?



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Remove power to all aftermarket components, if you know how to use a multi-meter connect to power source inside vehicle.. Drive normal, if voltage drops below 12v while driving, it is faulty alternator. If bat light comes on and voltage is above 12v the plug on the alternator might be correded and throwing faulty light, or bad ground in gauge cluster...

Posted on Jan 23, 2009


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If you're sure the alternator is ok then there is another issue. I would definitely check all the fuses. I would need the make and year to further assist.

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Check for blown fusible link and possible bad relay. On relay, with everything off and hot battery hook u battery and give it ten minuets or so, then feel the top of eac relay. if you find a warm or hot one Bingo!

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I have a 2002 Mitsubishi Diamante, the battery is brand new and the alternator has tested good. The car will start up and drive, eventualy the battery light comes on as well as all the other lights and...

(1) Loose connection on your battery terminal(s). You should not be able to move the connections on your battery by hand at all. (2) Loose or missing alternator belt. (3) Faulty alternator. (4) Electrical short.

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2000 ford excursion battery light wont shut off

Take it to a national chain parts store like Autozone and have them test your alternator. Have them test your whole electrical system. It quick and its free. I'm thinking your alternator/battery is going bad. Hope this helps you out.

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1 Answer

2003 Ford Windstar----I had battery light, abs and brake light intermittantly coming on. Found that alternator was over charging and there was a bad wire overheating going from battery and fuse panel. ...

Hello, It could be what you said. But if you know the Voltage was too high, you may want to replace the Ignition Relay and the Fuel pump Relay. If the contact points are cooked, they could work intermittently and it would be difficult to test. A bump or a little overheating could cause the contact points to break loose and then work when they cool.

It is good that the "check lights" are off. I always tell my clients that the scans are free at Autozone, Oreillys, and Advance. Some things like Relays may not trigger a light.

Be careful with a Wiggle test, but you may find a short in the wiring by shaking the wiring under the hood. I doubt the Voltage Regulator is causing your current stalling problem. A fully charged Battery without a Regulator or an Alternator would provide an amount of reliable power until the Battery was drawn down.

I hope my Solution is very helpful.

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2 Answers

My battery light has suddenly come on and the alternator has started to make a noise do i require a new one or is there something else i should be looking at.this is on a ford focus st year 2006.

My ST alternator took some time to completely fail. During the decline, I saw all kinds of random electrical issues. My advice-go ahead and replace the alternator unless you don't mind needing to tow the car (or you travel really short distances). At some point, you'll find every electrical system completely shut down (one of your computers will funnel all available battery energy to the engine and fuel pump). From that point you've got a very short distance till the battery is exhausted. This doesn't mean the battery is toast!

Having the system tested is of little value. My car-the "BATT" light was ON when it was tested, and I was told it needed a new battery. Indeed, until the very end, the voltage provided by my alt was about 14.4VDC-even with the light on.

Replace the alternator now or do it later after a tow.

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1 Answer

2002 Jeep Liberty Intermittant electrical problem - battery light

Have the alternator, regulator tested for shorts/malfunctions. Hope this helps.

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My battery light came on and my battery dies like i aint getting a charge and when i charge the battery it starts everytime alternater is good what could it be

How do you know alternator is good?
Put in a cheap volt gauge.
Should read 12.5 normal.
Down to 10 starting.
Back to 12.5 at idle.
Up to 13.5 when engine revved up.

But battery low on water will not hold charge.
Could also have internal short.
Volt gauge will show.

Could also have something staying on, like engine or trunk compartment light?
Pull one battery terminal, and see if test light lights up across gap. If it does, even weak, you have a constant drain. Could be alternator. When diodes go bad, alternator can drain battery. Disconnect things until light goes out.

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3 Answers

Battery light comes on intermittantly while driving I had the battery tested and alternator everything was fine???Is it safe??

You have an intermitt issue. Test battery voltage when light is on. More than likely alternator (also check the belt that drives it) or poor battery connection (must be clean and tight).

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